本文旨在設計海潮流發電用市電併聯型變流器，在預設的輸入電壓變動範圍內皆能保持輸出電壓大小。因為輸入電壓會在一定的範圍內變動，故針對此設計控制流程，降低對輸出電壓所造成之影響。在獨立供電模式時，利用電壓回授控制來調整波寬調變之導通率，使輸出電壓保持在預設電壓範圍內。在市電併聯模式時，利用電流回授控制來限制輸出電流大小，以達到控制輸出功率之目的。最後，由實驗和模擬結果來驗證控制理論與設計流程，在獨立供電模式時變流器之效率可達91%以上。

The design and implementation of grid-connected type inverter for tidal current power generation system is presented in this thesis. The output voltage would be stable in the default variation of input voltage. Because the input voltage will be varied in certain range, so a control procedure is made to reduce the influence to output voltage. Under stand-alone mode, the voltage feedback control is used to adjust the duty of pulse-width modulation and maintain output voltage in the default range. Under grid-connected mode, the current feedback control is used to limit output current for the purpose of output power control. Finally, the experimental result and PSIM simulation are presented to verify the control theorem and design procedure of inverter, and efficiency of inverter could be more the 91% under stand-alone mode.

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